Unbalance vibrator for setting of concrete in sheet-steel-molds of machines for production of concrete-stones or concrete-finished products

ABSTRACT

An unbalance vibrator for setting of concrete in steel-sheet molds of machines for the production of concrete stones or concrete finished articles, which comprises a housing, a vertical unbalance shaft, two unbalance weights settable relative to each other and disposed on top of each other, to provide an upper and a lower unbalance weight. The lower unbalance weight is rigidly secured to the unbalance shaft by means of a hub. The upper unbalance weight is settable in peripheral direction. The unbalance shaft has bores. A socket head cap screw is received in the hub of the upper unbalance weight, and enters the bores of the unbalance shaft. The housing has an opening, and a cover screw closes the opening, and the latter renders accessible the socket head cap screw.

United States Patent Strasser et a1.

[451 Feb. 19, 1974 [76] Inventors: Heinrich Strasser, Teufenbach 134;

Hans Krapinger, Teufenbach 60, both of Teufenbach, Austria [22] Filed: Aug. 3, 1972 [21] Appl. No.: 277,770

[52] US. Cl 74/87, 74/242.13 A, 259/D1G. 42,

[51] Int. Cl. Fl6h 7/08 [58] Field of Search 74/61, 87, 242.13 A;

259/DIG. 42; 209/366, 366.5, 367, 326; 184/13 R; 267/158, 165

[56] References Cited UNITED STATES PATENTS 3,522,740 8/1970 Hynes et a1. 74/87 2,902,868 9/1959 Ferrara 2/1950 Thompson 184/13 R 2,663,554 12/1953 De Langen 74/61 2,852,946 9/1958 Petrin 74/87 X 2,972,688 2/1961 Mahlfeldt 74/87 UX Primary Examiner-Allan D. Herrmann Attorney, Agent, or Firm-Ernest G. Montague [57] ABSTRACT An unbalance vibrator for setting of concrete in steel sheet molds of machines for the production of concrete stones or concrete finished articles, which comprises a housing, a vertical unbalance shaft, two unbalance weights settable relative to each other and disposed on top of each other, to provide an upper and a lower unbalance weight. The lower unbalance weight is rigidly secured to the unbalance shaft by means of a hub. The upper unbalance weight is settable in peripheral direction. The unbalance shaft has bores. A socket head cap screw is received in the hub of the upper unbalance weight, and enters the bores of the unbalance shaft. The housing has an opening, and a cover screw closes the opening, and the latter renders accessible the socket head cap screw.

4 Claims, 6 Drawing Figures PATENTEUFEB19|974 3.792.617

SHEET 1 U? 2 FIG./

UNBALANCE VIBRATOR FOR SETTING OF CONCRETE IN SHEET-STEEL-MOLDS OF MACHINES FOR PRODUCTION OF CONCRETE-STONES OR CONCRETE-FINISHED PRODUCTS The present invention relates to an unbalance vibrator for the setting of concrete in steel-sheet molds of machines for the production of concrete stones or of concrete finished articles, in general, and in particular to such machine, which has two oppositely settable unbalance weights on a vertical unbalance shaft on top of each other, as well as an oil lubrication.

In a known unbalance vibrator of this type, the securing of the settable unbalance weight takes place by use of slotted bearing eyes and clamping screws inserted into the latter, thus merely by a clamping effect. This requires not only an appreciable constructive expenditure, rather has also the drawback, that the securing does not live up to the high requirements during operation of the unbalance vibrator and thus an undesirable displacement of the one unbalance weight occurs.

It is furthermore known in unbalance vibrators, which have a horizontally disposed unbalance shaft, to provide a disc joining the rotation with the unbalance shaft with an angular edge part, which is suspended in an oil bath and furthermore causes a movement of a lubrication oil. For an unbalance vibrator with a vertical unbalance shaft such construction is, however, not useable.

It is, therefore, one object of the present invention, to provide an unbalance vibrator, by the constructive embodiment of which a greater safety against a change of the position of the settable unbalance weight is provided, and in which the position change of the unbalance weight is simplified. Also, an improvement of the oil lubrication is aimed at.

It is another object of the present invention, to provide an unbalance vibrator for setting of concrete in sheet-metal molds, wherein the driving motor, by example, an electro-motor, is arranged such, that no disturbing oscillations are transmitted to the driving motor, whereby, however, the V-belt provided for the drive of the unbalance shaft receives a tension, so that a safe drive can be brought about.

Furthermore, unbalance vibrators are known, in which the unbalance shaft is driven via a V-belt or the like, tensioned by means of springs or the like by a motor. This known construction assumes a machine mounted in pendulum manner and fixed points for suspension of springs engaging the machine.

It was usual until now, to connect the driving motor with the housing of the unbalance vibrator by the use of so-called elastic springs, which have, however, on the one hand, a short life, on the other hand are not suitable for a sufficient tension of the V-belt, so that additional tensioning devices were required.

Also, it is known, to tension the driving or take-off belt of a machine which is mounted in a pendulum manner by springs engaging the latter. This is only possible, if fixed points are available for the suspension of the springs.

The set task is solved in accordance with the present invention, at first such, that the lower unbalance weight is disposed by means of a hub securely on the unbalance shaft and the second, upper unbalance weight is arranged adjustably, in peripheral direction in the hub of which is disposed a socket head cap screw, engaging in bores of the unbalance shaft, whereby in a housing of the unbalance vibrator an opening is provided, which can be closed by a cover screw, through which the socket head cap screw is accessible. The solution according to the present invention for the variation of the unbalance is particularly simple and offers a handling without effort and absolute security against undesirable displacements of the settable unbalance weight.

The present invention extends further to the point that each unbalance weight has, following the hubs serving the securing on the unbalance shaft slots disposed concentrically to the turning axis. By this arrangement a better cooling of the unbalance vibrator is obtained.

For the improvement of the oil lubrication, the present invention provides, that on the bottom side of the lower unbalance weight an oil finger is provided, which projects into a groove filled with oil and provided in the housing. By this arrangement the pre-whirl of the lubrication oil is obtained and also a lubrication of the upper bearing of the unbalance shaft is provided.

The present invention finally extends also to the point, that in an unbalance vibrator, the unbalance shaft of which is driven by means of a V-belt or the like tensioned by springs by means of a motor, and the motor is disposed on a free arm of a U-shaped steel spring secured on a housing of the unbalance vibrator.

By the use of U-shaped steel springs, on the one hand an elastic connection of the motor with the unbalance vibrator is brought about. The used steel springs are produced simply and have a long life. Furthermore, the steel springs provided in accordance with the present invention are well suitable to retain the V-belt and the like under corresponding tension.

With these and other objects in view, which will become apparent in the following detailed description, the present invention which is shown by example only, will be clearly understood in connection with the accompanying drawings, in which:

FIG. 1 is an axial section of an unbalance vibrator, designed in accordance with the present invention;

FIG. 2 is a top plan view of an unbalance weight; and

FIGS. 3 to 6 show different connections of the driving motor with the unbalance vibrator.

Referring now to the drawings, and in particular to FIGS. 1 and 2, a vertical unbalance shaft 6 is mounted in a housing in roller bearings 5 and 5a. An unbalance weight 3 is rigidly arranged on the unbalance shaft 6 and above the unbalance weight is swingably mounted an unbalance weight 3a. For securing of the swingable unbalance weight 3a a socket head cap screw 8 is screwed in its hub, which screw 8 enters bores 8a of the unbalance shaft 6. In the housing 1 is provided a bore closeable by a cover screw 7, through which bore the screw 8 is accessible and can be operated by means of a socket wrench.

In the lower part of the housing 1 is arranged a groove 2, into which lubrication oil can be filled. In this groove 2 enters an oil finger 4, which is provided on the bottom side of the lower unbalance weight. During rotation of the unbalance shaft 6, the lubrication oil is whirled up by means of the oil finger 4 and a lubrication of the two roller bearings S and 5a is brought about.

The two unbalance weights 3 and 3a have, following the hub serving the securing on the unbalance shaft 6,

slots 9 lying concentrically to the rotating axis, with slots 9 cause an air movement and thereby contribute to the cooling. By this arrangement, the otherwise strong heating is prevented, on the one hand, by the improved lubrication, and on the other hand, a corresponding cooling.

The present invention makes possible also a particularly low type of structure and, thereby, a reduction of the distance of the two roller bearings 5 and 5a, whereby a better mounting of the unbalance shaft is obtained and a damage of the bearings in particular a strong heating is prevented.

In the embodiment disclosed in FIG. 3, an electromotor 12 is provided for the drive of a vertically arranged unbalance shaft 6 of the unbalance vibrator, which electro-motor 12 drives by means of a V-belt 11 and a V-belt disc the unbalance shaft 6. The electromotor 12 is secured on the free arm of a U-shaped bent steel spring 13, which in turn is secured with its arm 14 on the housing 1 of the unbalance vibrator.

FIG. 4 shows a steel spring 13 in another bending form, whereby the electro-motor 12 is again secured on the free arm 15 of the steel spring 13, which steel spring 13 is connected with the housing 1 of the unbalance vibrator by the use of the arm 14. The drive of the unbalance shaft 6 takes place again over a V-belt disc 10 and the V-belt 11, which is maintained in tension by means of the steel spring 13.

FIG. 5 shows another bending form for the steel spring 13. Here the electro-motor 12 is connected again with the free arm 15 of the U-shaped bent steel spring 13 and the steel spring 13 itself is secured with its arm 14 on the housing 1 of the unbalanced vibrator. Also in connection with this bending form of the steel spring 13, the V-belt ll obtains a corresponding tension'in order to obtain a safe drive of the unbalance shaft 6.

FIG. 6 finally shows a fourth embodiment of a steel spring 13, whereby the motor 12 is secured with the free arm 15 of the U-shaped bent steel spring 13, which latter in turn is connected with the housing I of the unbalance vibrator on its arm 14. Also in this embodiment a sufficient tension of the V-belt 11 is taken care of.

The shown and described embodiments serve merely for explanation of the essence of the present invention without limiting the same to individual structures.

While I have disclosed several embodiments of the present invention, it is to be understood that these embodiments are given by example only and not in a limiting sense.

We claim:

1. An unbalance vibrator for setting of concrete in steel-sheet molds of machines for the production of concrete stones or concrete finished articles, comprising a housing,

a vertical unbalance shaft rotatably mounted in bearings in said housing,

two unbalance weights settable relative to each other and disposed on top of each other, to provide an upper and a lower unbalance weight,

said lower unbalance weight being rigidly secured to said unbalance shaft by means of a hub,

said upper unbalance weight being settable in peripheral direction,

said unbalance shaft having bores,

a socket head cap screw received in the hub of said upper unbalance weight, and entering said bores of said unbalance shaft,

said housing having an opening, and

a cover screw closing said opening, and the latter rendering accessible said socket head cap screw,

an oil finger on the bottom side of said lower unbalance weight, and

said housing has a groove, adapted to be filled with oil, and receiving said oil finger, whereby the oil is whirled up directly by said oil finger onto said bearings when said lower unbalance weight is rotated.

2. The unbalance vibrator, as set forth in claim 1, wherein each of said unbalance weights has slots disposed concentrically to the rotating axis and following said hubs serving the securing of unbalance weights on said unbalance shaft.

3. An unbalance vibrator for setting of concrete in steel-sheet molds of machines for the production of concrete stones or concrete finished articles, comprising a housing,

a vertical unbalance shaft,

two unbalance weights settable relative to each other and disposed on top of each other, to provide an upper and a lower unbalance weight,

said lower unbalance weight being rigidly secured to said unbalance shaft by means of a hub,

said upper unbalance weight being settable in peripheral direction,

said unbalance shaft having bores,

a socket head cap screw received in the hub of said upper unbalance weight, and entering said bores of said unbalance shaft,

said housing having an opening, and

a cover screw closing said opening, and the latter rendering accessible said socket head cap screw,

a motor,

belt means tensioned by spring means and driving said unbalance shaft by said motor,

a U-shaped steel spring secured to said housing, and

having a free arm, and

said motor is disposed on said free arm.

4. An unbalance vibrator for the setting of concrete in steel-sheet molds of machines for the production of concrete stones or concrete finished articles, comprising a vertical unbalance shaft,

a motor,

belt means tensioned by spring means and driving said unbalance shaft by said motor,

a U-shaped steel spring secured to said housing, and

having a free arm, and

said motor is disposed on said free arm. 

1. An unbalance vibrator for setting of concrete in steel-sheet molds of machines for the production of concrete stones or concrete finished articles, comprising a housing, a vertical unbalance shaft rotatably mounted in bearings in said housing, two unbalance weights settable relative to each other and disposed on top of each other, to provide an upper and a lower unbalance weight, said lower unbalance weight being rigidly secured to said unbalance shaft by means of a hub, said upper unbalance weight being settable in peripheral direction, said unbalance shaft having bores, a socket head cap screw received in the hub of said upper unbalance weight, and entering said bores of said unbalance shaft, said housing having an opening, and a cover screw closing said opening, and the latter rendering accessible said socket head cap screw, an oil finger on the bottom side of said lower unbalance weight, and said housing has a groove, adapted to be filled with oil, and receiving said oil finger, whereby the oil is whirled up directly by said oil finger onto said bearings when said lower unbalance weight is rotated.
 2. The unbalance vibrator, as set forth in claim 1, wherein each Of said unbalance weights has slots disposed concentrically to the rotating axis and following said hubs serving the securing of unbalance weights on said unbalance shaft.
 3. An unbalance vibrator for setting of concrete in steel-sheet molds of machines for the production of concrete stones or concrete finished articles, comprising a housing, a vertical unbalance shaft, two unbalance weights settable relative to each other and disposed on top of each other, to provide an upper and a lower unbalance weight, said lower unbalance weight being rigidly secured to said unbalance shaft by means of a hub, said upper unbalance weight being settable in peripheral direction, said unbalance shaft having bores, a socket head cap screw received in the hub of said upper unbalance weight, and entering said bores of said unbalance shaft, said housing having an opening, and a cover screw closing said opening, and the latter rendering accessible said socket head cap screw, a motor, belt means tensioned by spring means and driving said unbalance shaft by said motor, a U-shaped steel spring secured to said housing, and having a free arm, and said motor is disposed on said free arm.
 4. An unbalance vibrator for the setting of concrete in steel-sheet molds of machines for the production of concrete stones or concrete finished articles, comprising a vertical unbalance shaft, a motor, belt means tensioned by spring means and driving said unbalance shaft by said motor, a U-shaped steel spring secured to said housing, and having a free arm, and said motor is disposed on said free arm. 